Heat Treatment of Steel Sulphuric AcidSodium Dichromate Etch

Page 116 Part 2 ✈ Chapter 3 - Checklists MRA – 1st Edition September 1998 Part 2 ✈ Chapter 2 - Airworthiness Audit Policy and Procedures Items References Result A-3 Are temperature uniformity surveys conducted? Are the survey results recorded and kept on file? QPM OK FDG NA A-4 Are the batch numbers or work order numbers entered on the temperature recording charts? QPM OK FDG NA A-5 Are pyrometric testing and calibration of equipment carried out? Are certificates available? QPM OK FDG NA A-6 Is the following data recorded for each furnace load: - the part and batch number; - the time in, time out and date; and - the quantity? QPM OK FDG NA A-7 Are laboratory test specimens included with the furnace load when required? QPM OK FDG NA A-8 Are parts hardness tested after heat-treatment? QPM OK FDG NA A-9 Are mechanical or metallurgical tests performed? QPM OK FDG NA Items Certified – Completed by:

3.8.12 Sulphuric AcidSodium Dichromate Etch

Items References Result A-1 Are specifications and processing procedures available to the operator and are they in use? QPM OK FDG NA Part 2 ✈ Chapter 3 - Checklists Page 117 Part 2 - Airworthiness Audit Policy and Procedures MRA – 1 st Edition September 1998 Items References Result A-2 Are parts adequately cleaned prior to the sulphuric acidsodium dichromate etching? QPM OK FDG NA A-3 At what temperature are the baths maintained? QPM OK FDG NA A-4 Is deionized water used to spray-rinse parts? QPM OK FDG NA A-5 Are records of the etch solution analysis kept on file? QPM OK FDG NA Items Certified – Completed by:

3.8.13 Vapour Degreasing Specification Materials

Items References Result A-1 Which of the following materials are used: - trichloroethylene; - tetrachloroethylene perchloroethylene; - 1, 1, 1, trichloroethane; - sodium carbonate, or - other? QPM OK FDG NA A-2 Are there any restrictions on the types of material that can be degreased? QPM OK FDG NA A-3 Are parts placed in baskets to ensure adequate draining? QPM OK FDG NA A-4 Is the vapour degreaser tank covered when not in use? QPM OK FDG NA Page 118 Part 2 ✈ Chapter 3 - Checklists MRA – 1st Edition September 1998 Part 2 ✈ Chapter 2 - Airworthiness Audit Policy and Procedures Items References Result A-5 Is the temperature of the degreaser boiling chamber maintained within the proper range? QPM OK FDG NA A-6 If the operating temperature exceeds the recommended temperature range, what action is taken? QPM OK FDG NA Items Certified – Completed by:

3.8.14 Aluminum Brazing Dip Brazing

Items References Result A-1 Are operators qualifiedcertified? QPM OK FDG NA A-2 Is the temperature-recording equipment calibrated? QPM OK FDG NA A-3 Are circulating air ovens used to preheat parts? Are the ovens temperature-controlled? QPM OK FDG NA A-4 Are all parts brazed according to an approved schedule? QPM OK FDG NA A-5 Are test pieces available? Do test pieces undergo NDT? QPM OK FDG NA A-6 Are approved cleaning procedures adhered to? QPM OK FDG NA A-7 Are all brazed joints usually inspected? Are fillets of a uniform radius? QPM OK FDG NA A-8 Are parts checked for distortion? QPM OK FDG NA A-9 Are parts checked for porosity and cracks open to the surface? QPM OK FDG NA